Jak tylko równania: (po kolei od lewej do prawej)
2α + α + 120° = 180°
3α + 4α + 2α + α = 360°
50° + α + α = 180°
α + 2α + 30° = 180°
α + (180° - α) + 2α + 70° = 360°
α + 2α = 90°
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Jak tylko równania: (po kolei od lewej do prawej)
2α + α + 120° = 180°
3α + 4α + 2α + α = 360°
50° + α + α = 180°
α + 2α + 30° = 180°
α + (180° - α) + 2α + 70° = 360°
α + 2α = 90°